Bobbin-winding attachment.



J, D. KARLE.

' BOBBIN wmome ATTACHMENT.

APPLICATION FILED MAY 19m.

Patented Jn. 7, M19.

YNVENTUR JOHN D. KARI 1E, F ROSELLE PARK, NEW JERSEY,

ASSIGNOR TO THE SINGER MANU- FACTURING COMPANY, A CORPORATION 015 NEW JERSEY.

BOBBIN-WINDING ATTACHMENT.

Specification of Letters Patent.

Patented J an. 7, 1919.

Application filed May 2, 1918. Serial No. 231,988.

To all whom it may concern:

Be it known that 1, JOHN citizen of the United States, residing at Roselle Park, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Bobbin- Winding Attachments, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to attachments for sewing machines for winding thread on bobbins which, as is well known, carry the under thread of lock-stitch machines.

The present invention is an improvement of the construction disclosed in the prior patents to Eames & Finch No..809,911, of Jan. 9, 1906 and Karle No. 1,014,483, of Jan. 9,;1912. It aims to cheapen the cost of D. KAnLn, a

manufacture of the type of bobbin-winder shown in these patents and to better their operation by relieving the operator of the necessity of guiding the thread While it is being wound, thereby conserving her time and ener y. V

lit consists of a sheet-metal base-platehaving ears struck u at one end thereof on which ears the loo bin winding mechanism is operatively supported adjacent a belt driving the sewing machine and of a threadguide formed in an angle-plate which 1s adjustably secured at the opposite end of the base-plate at such a distance from the bobbin-winding mechanism that the thread being wound can distribute itself uniformly over the bobbin being filled.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a plan lview' and Figs. 2 and 3 are side and end elevations, respectively, thereof. Fig. 4: is a vertical section through the bobbinwinding mechanismand Fig. 5 is a plan view of one end of the sheet-metal base in its blank form.

An elongated sheet-metal base 1 is stamped out to form ears 2, 3, 3 and 4, the form of the blank being illustrated in Fig. 5. The first three of the ears men tioned are subsequently bent up at substantially right angles to the body of the base. Hinged to and standard or frame 5 carrying a shaft 6, pulley 7 and holder 8, and connecting the ear 2 with an arm 9 of thestandard or frame 5 are the toggle links 10 and 11, the latter of which carries a trip-finger 12. The parts as disclosed in the between the ears 3-3 is a are constructed and operated substantially above IIIGIIlLlOIlGLl patents and no extended descriptlon 1s therefore nocessary.

Tn the standard or frame 5 a socket 13 is provided to receive the spring 14 which thrusts a plunger 15 against the ear 4 of the base-plate and tends to hold the frame or standard either in a raised its pulley 7 tracking a belt (not shown) of a sewing machine or in a lower position out of engagement with the belt and against the brake-pin 16 suitably secured in the sheetmetal base 1. The action results from the disposition andarrangement of the toggle links 10-11 relative to the standard or frame 5 as will be readily understood by reference to the prior patents mentioned above.

Disposed at the end of the base 1 opposite to that on which the bobbin-winding mechanism is arranged is a sheet-metal plate 17 of angular form pierced to form a thread guiding eye 18 adjacent which a constant tension device 19 of any suitable form is secured. lln the plate 17 a slot 20 is provided to receive the clamping screw 21 which is threaded into the base 1 which base in turn is slotted at 22 to receive a blind rivet 23 stamped downwardly from the plate 17. The screw 21 and the slot 22 are arranged preferably in a line parallel to the axis of the shaft 6 and these expedients permit of adjusting the angle-plate 17 transversely of the base 1 and positioning the thread-guide 18 in perpendicular bisecting relation with the axis of the bobbin which is indicated at 24. The base 1 is preferably bent as indicated at 25 to conform to the trough commonly provided in power-tables in general use. Slots 26 are also provided in the base 1 for mounting the attachment conveniently and securely in juxtaposition to the driving belt of a sewing machine.

The thread of course passes from a source of supply to the constant tension 19, thence through the eye 18 to and around the bobbin 24 which is adapted to be rotated at the pleasure of the operative by straightening out the toggle links 10-11 so that they assume the position shown in Fig. 2 with the pulley 7 in contact with a belt driving the sewing machine at which the operator is working. When the bobbin is filled the trip-finger 12 throws the knuckle-joint of position with the toggle across and to the opposite side of a line connecting the-outer end pivots of the links 10-11, thereby permitting the spring-pressed plunger-pin 15 to swing the standard or frame 5 out of contact; with the belt driving it and against the brake-pin 16 which quickly arrests rotation of the bobbin.

The construction described is easily and cheaply produced in quantity. The distance between the thread-guide 18 and bobbin 24 permits the thread to distribute itself uniformly across. the width of the bobbin without any attention or care from the opera ator. The common base supporting both the guide and bobbin winding mechanism insures reliability in self distribution of the thread not attainedin. any prior attachment of this same type and; simplifies the setting up of power-tables to which it is especially suited.

Having thus set forth the nature of the invention, what I claim herein is 1. In a bobbin-winding attachment for belt driven sewing machines, in combination, a sheet-metal base-plate of elongated form, a plurality of ears struck up from said sheet-metal base-plate at one end thereof, a rotatable bobbin-winding mechanism pivotally connected and supported by said cars, a sheet-metal plate having a thread guiding aperture therein and secured to the other end of said base-plate with the aperture at a relatively great distance from the bobbin-winding mechanism, whereby thread being wound on a bobbin is self distributed.

2. In a bobbin-winding attachment for belt driven sewing machines, in combination, a sheet-metal base-plate having a plurality of ears in one piece therewith, and a rotatable bobbin-winding mechanism operatively supported by said ears and including a swinging standard having a springpressed plunger socketed therein, the plunger being adapted to thrust against said sheet-metal base-plate.

3. In a bobbin-winding attachment. for belt driven sewing machines, in combination, a sheet-metal base-plate of elongated form, a plurality of cars struck up from said sheet-metal base-plate at one end thereof, a rotatable bobbin-winding mechanism pivotally connected and supported by said ears, a sheet-metal plate of angular form secured to the other end of said base-plate and having a thread-guiding aperturetherein, a tension device secured to said sheetmetal plate adjacent said thread-guiding aperture, said sheet-metal plate being adjustable transversely of the base-plate in order to locate said thread-guiding aperture in. perpendicular bisecting. relation to the axis of the bobbin being wound. 1

In testimony whereof, I have signed m name to this specification.

JOHN D. KARLE. 

